I see that the address offset for Cyclone IV at Remote Update Intel® FPGA IP User Guide is different than at your example.
I think it should be:
alt_u32 mode = IORD_32DIRECT(REMOTE_UPDATE_0_BASE, 0) & 3;
alt_u32 config_reason = IORD_32DIRECT(REMOTE_UPDATE_0_BASE, 0x18);

if ((mode == 0) && (config_reason == 0)) {
IOWR_32DIRECT(REMOTE_UPDATE_0_BASE, 0x0C, 0); // Turn off watchdog
IOWR_32DIRECT(REMOTE_UPDATE_0_BASE, 0x10, app_bitstream_addr);

IOWR_32DIRECT(REMOTE_UPDATE_0_BASE, 0x1D, 1); // Trigger reconfiguration

I can’t verify it as still waiting for the board with FPGA arrive from production.
Please correct me if I wrong!!

Thank you

Alex

const struct {
const struct regitem *list;
char *desc;
} modetab[5] = {
{ factoryparams, “Factory mode” },
{ applicationparams, “Application mode” },
{ unknownparams, “Unknown mode” },
{ applicationparams, “Application mode with watchdog enabled” },
{ unknownparams, “Unknown mode” },
};

cf. user guide:
00—Factory mode.
01—Application mode.
11—Application mode with the master state machine
user watchdog timer enabled

very helpful and very clear because altera’s documentation is a bit confusing so your application helps to find the necessary informations, good job!